Canon's Live View implementation may not be a deal-breaker for most DSLR users, but there's certainly plenty of room for improvement, and a recent Canon patent application suggests that the company could possibly be aiming to do just that. The short of it is that the company seems to have found a way to overcome the inherent problems of employing so-called phase-difference autofocus in Live View, which is caused in part by the physical limitations of the mirror and the AF sensor (hit up the read link for some more background). Canon's solution, it seems, is to place the phase-difference AF sensor below the image sensor instead of above it, and make use of a semi-transparent mirr
